If you don't mind continuity errors, you can watch most of the episodes in the first season – except multi-part episodes, of course – in whatever order you want to. You should definitely watch the episodes in order, though. It is very rewarding that way – in the beginning mostly because of character development and a few episodes in also due to the story arcs.
Be advised that your best guide to watch the episodes in order is the production code which is shown on Wikipedia (There's also a list sorted by production code over at Farscape World). For instance, I, E.T. was intended to be the second episode but it was aired as the seventh. It's not really troubling but if you're an observant watcher, you will notice some discrepancies. Some DVD and Blu-Rays sets are also out of order because they used the order the episodes were originally aired.
There's also a Skip It/Watch It guide that can help you out if you're in a hurry. I don't necessarily agree with some of the suggestions but let me be clear on that: Jeremiah Crichton definitely is the worst episode Farscape has to offer. I advise against skipping any episode. Most episodes considered skipable give quite a bit of backstory or hint at something that's further explored in future episodes.
That being said, it's easier to watch every episode in the intended viewing order than trying to determine what episode you can safely skip or watch later without being confused. If you don't mind continuity, you can watch the first dozen episodes or so out of order. Be advised, there are almost no stand-alone episodes later on so you shouldn't even think about going that route. Under no circumstances mix up the viewing order of the multi-part episodes!